Class NodeOp

Since version 7.9 this class supports creation of a lazy node -
a node that displays basic information
about the original node behind it, without touching the original. As soon as
the node is expanded, or a pop up menu is invoked on it, it switches
to the real delegates and since then everything is being bridged to
the real node.
This method is especially useful when used from
layers.
Use following
XML snippet to register your node into Services tab: